Properties

Label 2.83.ag_gk
Base field $\F_{83}$
Dimension $2$
$p$-rank $1$
Ordinary no
Supersingular no
Simple no
Geometrically simple no
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

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Invariants

Base field:  $\F_{83}$
Dimension:  $2$
L-polynomial:  $( 1 - 6 x + 83 x^{2} )( 1 + 83 x^{2} )$
  $1 - 6 x + 166 x^{2} - 498 x^{3} + 6889 x^{4}$
Frobenius angles:  $\pm0.393189690303$, $\pm0.5$
Angle rank:  $1$ (numerical)
Jacobians:  $480$
Cyclic group of points:    no
Non-cyclic primes:   $2, 3$

This isogeny class is not simple, primitive, not ordinary, and not supersingular. It is principally polarizable and contains a Jacobian.

Newton polygon

$p$-rank:  $1$
Slopes:  $[0, 1/2, 1/2, 1]$

Point counts

Point counts of the abelian variety

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $6552$ $49533120$ $327672262008$ $2251490324428800$ $15515549579177319672$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $78$ $7186$ $573066$ $47441422$ $3938915838$ $326941027234$ $27136058410266$ $2252292222392158$ $186940255162645998$ $15516041187385478386$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 480 curves (of which all are hyperelliptic):

  • $y^2=41 x^6+17 x^5+33 x^4+8 x^3+25 x^2+25 x+26$
  • $y^2=35 x^6+59 x^5+8 x^4+20 x^3+8 x^2+59 x+35$
  • $y^2=56 x^6+37 x^5+72 x^4+72 x^3+76 x^2+23 x+55$
  • $y^2=30 x^6+54 x^5+77 x^4+69 x^3+72 x^2+5 x+28$
  • $y^2=56 x^6+13 x^5+14 x^4+66 x^2+45 x+20$
  • $y^2=6 x^6+70 x^5+9 x^4+17 x^3+9 x^2+70 x+6$
  • $y^2=52 x^6+27 x^5+25 x^4+79 x^3+58 x^2+4 x+5$
  • $y^2=80 x^6+50 x^5+34 x^4+69 x^3+36 x^2+9 x+43$
  • $y^2=82 x^6+74 x^5+x^4+81 x^3+21 x^2+60 x+16$
  • $y^2=42 x^6+29 x^5+32 x^4+61 x^3+75 x^2+73 x+1$
  • $y^2=10 x^6+20 x^5+47 x^4+12 x^3+80 x^2+7 x+54$
  • $y^2=82 x^6+5 x^5+39 x^4+53 x^3+46 x^2+76 x+8$
  • $y^2=81 x^6+4 x^5+10 x^4+52 x^3+13 x^2+28 x+61$
  • $y^2=82 x^6+67 x^5+12 x^4+37 x^3+22 x^2+71 x+46$
  • $y^2=79 x^6+30 x^5+2 x^4+9 x^3+51 x^2+32 x+69$
  • $y^2=58 x^6+30 x^5+52 x^4+26 x^3+41 x^2+19 x+77$
  • $y^2=42 x^6+74 x^5+47 x^4+62 x^3+62 x^2+14 x+59$
  • $y^2=2 x^6+34 x^5+3 x^4+6 x^3+42 x^2+14 x+46$
  • $y^2=74 x^6+80 x^5+52 x^4+50 x^3+36 x^2+32 x+51$
  • $y^2=11 x^6+17 x^5+44 x^4+65 x^3+9 x^2+56 x+12$
  • and 460 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{83^{2}}$.

Endomorphism algebra over $\F_{83}$
The isogeny class factors as 1.83.ag $\times$ 1.83.a and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:
Endomorphism algebra over $\overline{\F}_{83}$
The base change of $A$ to $\F_{83^{2}}$ is 1.6889.fa $\times$ 1.6889.gk. The endomorphism algebra for each factor is:

Base change

This is a primitive isogeny class.

Twists

Below is a list of all twists of this isogeny class.

TwistExtension degreeCommon base change
2.83.g_gk$2$(not in LMFDB)